Here is my critique. It's not official so take it or ignore it. 

I think the way they are currently described is not really what you would expect from beings created for the singular purpose of war. Realistically, you would not bother with things like breeding, emotion, or any of those "human" attributes. If we created war machines in real life, we would not even bother with putting skin on them. We'd make them robots with the singular purpose of waging war, because that is the most effective application for such a thing, practically and economically. Emotion is detrimental when your only purpose is to kill. 

But I understand robots don't really fit in with the RP.

So what I would suggest, to explain why they still breed and all that, is maybe make them some conquered race of people that the Old Ones (is that what we're calling them?) annihilated and attempted to clone to be used as slaves (it would explain the emphasis on strength) with a little bit of genetic manipulation to make them ideal laborers. Ideally, though, you should shroud their origin in mystery because it wouldn't make sense for them to know exactly what they are.